Hamburger Steak with Mushroom and Onion Gravy

Ingredients

For the Hamburger Steaks:

1 lb ground beef (80% lean)
1/4 cup breadcrumbs
1/4 cup milk
1/4 cup finely chopped onion
1 large egg
1 tbsp Worcestershire sauce
1 tsp garlic powder
1 tsp onion powder
Salt and pepper to taste
2 tbsp vegetable oil (for frying)

For the Mushroom and Onion Gravy:

1 tbsp butter
1 tbsp vegetable oil
1 large onion, thinly sliced
8 oz mushrooms, sliced (button or cremini work well)
2 cloves garlic, minced
1/4 cup all-purpose flour
1 1/2 cups beef broth
1 tbsp Worcestershire sauce
Salt and pepper to taste